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Some tools need to be used both when creating diffs and when installing
diffs, so need to support the archs of both the target system and the
system generating the diffs. These are generally the same thing, but
when cross-compiling for arm64 on x86, it requires universal binaries.

BUG=1119472

Cq-Include-Trybots: luci.chromium.try:mac-rel,mac-arm64-rel
Change-Id: Ic329561b8f034477d491121e507ba34821419516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462242
Commit-Queue: Michael Moss <mmoss@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Auto-Submit: Michael Moss <mmoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818949}